The MK16 SMR is, of course, part of the USASOC URG-I (erroneously referred to as Block 3), which represents a popular look right now. 13.5” Available in bronze 10.5” Available In Bronze only The Super Modular Rail 13.5" (SMR) MK16 M-LOK (13.5”), has been adopted by USASOC for the URG-I program (Upper Receiver Group Improved). MK16 handguard for AR15/M4 is the ultimate replica ever in the market. Thanks for the scanner and Reverse-Engineering every details and curves are perfectly cloned and represent to you – the one true and end gamer:HRGI build EDM wirecut made latch deeply embedded into the rail body as the RS quality, make the barrel nut more secure . Correct M-Lok following the M-Lok standard Limited QD mount 1:1 scale made from 3D scanning technology Tags - please ignore this: Eotech 558 XPS XPS-2 EXPS 3x Magnifier G33 flip to side combo black tan 4x zoom trijicon mr 4x acog PEQ-15 green red laser lumen lumens peq La-5c peg15 block | Block II block 1 block 2 suppressor silencer noveske amplifier sniper magpul mbus rcnc keymod mlok m-lok tr str prs vltor hanguard